How do I import a custom made roller-chain into Autodesk Inventor 2011 for use

[Ryan Himmelblau]

in the design accelerator? I am currently designing a sprocket and chain system for a robot. I usually use the design accelerator for this type of job. The problem is that the sprockets and chains I am using are not industry standard. Is it possible to import my custom sprockets and chains into the design accelerator to make designing this system a lot easier?